| Year | 1977 |
| Date | 18-Feb |
| Volume | 143 |
| Issue | 3,555 |
| Page | 220 |
| Category | Hot Air |
| Part | |
| Title | Stirling Engines. More research and development |
| Author | W.D.Urwick |
| Notes | Regenerator construction, double-acting engine, four-cylinder swashplate engine, 4-square nutating plate Stirling engine |